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So it is altogether fit that a performer of wonders should be on intimate terms with the serpent tribe. The snake-charmer keeps all sorts of them, but chiefly cobras. These he professes to charm from their holes by playing upon an instrument which may have some hereditary connection with the bagpipe, for it has an air-reservoir consisting of a large gourd, and it makes a most abominable noise.
It is obvious, however, that the use of compressed air harmonises better with the railway system than any plan depending upon springs. The potential elasticity in an air-reservoir of portable dimensions is enormously greater than that of any metallic spring which could conveniently be carried.
Another and important peculiarity was an air-reservoir which received air from the pump direct, and then passed it on to the diver, so that even if the pumps should stop working there would still be a supply of air flowing down to the diver for several minutes.
A few minutes more and our divers were safely beyond the chance of capture, making for the mainland under a steady breeze. The pump used by Denayrouze of Paris, besides being very simple in its parts and action, possesses an air-reservoir which renders a cessation of the pump-action for a few minutes of no importance. Turn we now to Miss Pritty and a pretty sight she is when we turn to her!
The compartment which had distended itself to receive it, contracted in its turn, and the liquid finding the road again barred behind it, had no choice but to force its way through the tube which led to the air-reservoir. Here commenced the work of the second pump, the pump of the left compartment.
By-and-bye, when the pump and the steam-engine are explained to you, you will meet again with these treacherous doors, which never allow what has once entered to go back again; but then we shall call them valves. The air-reservoir, I need scarcely tell you, is the lung, to which the blood goes to put itself in contact with the air.
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